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  1. Vehicle Suspension
  2. Timbren
  3. Bump Stops
  4. Towing/Load Leveling
  5. Rear Axle Suspension Enhancement
  6. Extra Heavy Duty
THIS ITEM IS NOT A FIT FOR
2001 Chevrolet Tracker
Timbren

Timbren Suspension Enhancement System - Severe Service - Rear Axle

Part Number: TFRTT350J
In Stock
$398.07
Retail:$468.32
You Save: $70.25
Vehicle Suspension
Not Confirmed to Fit

2001 Chevrolet Tracker

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8,000-lb Capacity hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. Provides a comfortable ride by absorbing road shock and improving stability. Ideal for trucks with slide-in campers or an in-bed salt spreader. Great Prices for the best vehicle suspension from Timbren. Timbren Suspension Enhancement System - Severe Service - Rear Axle part number TFRTT350J can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Timbren Vehicle Suspension - TFRTT350J

  • Bump Stops
  • Towing/Load Leveling
  • Timbren
  • Rear Axle Suspension Enhancement
  • Extra Heavy Duty
  • Suspension Only

8,000-lb Capacity hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. Provides a comfortable ride by absorbing road shock and improving stability. Ideal for trucks with slide-in campers or an in-bed salt spreader.


Features:

  • Improves suspension, handling, and safety
    • Ideal for trucks with slide-in campers or an in-bed salt spreader
  • Provides additional support as needed so you always have a smooth, comfortable ride when towing or hauling gear
    • Allows the leaf spring ample movement while cushioning light loads
    • Becomes more rigid as more weight is added for a great performance when you're hauling a heavy load
      • Increases stability
      • Reduces vehicle sag
  • Works independently - side-to-side adjustment
    • Helps compensate for off-center loads
    • Reduces body roll when swerving and turning corners
  • Acts as a shock absorber, taking the brunt of bumps and rough roads
    • Extends the life of your vehicle's suspension
  • Includes 2 Aeon hollow rubber springs, custom-fit brackets, and hardware for simple installation
    • Installs directly onto frame
    • No drilling required


Specs:

  • Load-leveling capacity: 8,000 lbs
    • Timbren springs will not increase your vehicle's weight-carrying capacity. Do not exceed the manufacturer's recommended weight limit.
  • Lifetime warranty
  • Satisfaction guarantee


An example of sag on a vehicle's rear axle under a heavy load

Whether you're hauling heavy loads in your bed or cargo area or you're towing a trailer, you will often see the rear of your vehicle sag while the front end rises. In these cases, the rear axle is handling not only the weight of the cargo, but also more of the vehicle's weight. Because less weight is on the front axle, the front tires are making less contact with the road. Overall handling - traction, steering, and braking - is negatively affected. But the resistance from Timbren's Suspension Enhancement System works with your factory suspension to keep your vehicle level and improve your driving experience.


Diagram of the Timbren spring installed

The Timbren system comes with custom-fit brackets that are bolted onto each frame rail above the rear axle. Hollow rubber springs are bolted to the bottom of the bracket and hang down to where the bottom of the spring sits, 1" above the axle. The inch of clearance allows the existing factory suspension to operate normally under light loads and standard terrain, ensuring the smooth, comfortable ride that you are used to.


Animation of a standard Timbren rubber spring

Timbren Suspension Enhancement Systems are designed to work progressively. When the hollow rubber springs are compressed, the convoluted design causes them to quickly collapse along the folds. Once the folds are compacted, the stacked barrel shape increases resistance, stiffening the suspension and keeping your vehicle level.


Timbren suspension system works to prevent body roll

Each hollow rubber spring works independently to support the driver's side or passenger's side of your vehicle. This is helpful when you swerve or make sharp turns. Each spring is activated when it is needed, so body roll is greatly reduced. The independent action also works well when you are hauling off-center loads.


An example of a trailers swaying

Because the vehicle handles better with the springs, less turbulence will be passed along to the trailer, and this helps to keep the trailer in line. Your driving comfort is further enhanced if the trailer does begin to sway (from a gust of wind or a passing semi), because the movement from the trailer is not transferred to your vehicle. This also works to make the sway subside more quickly.


An empty truck on a bumpy road without Timbren

Another great feature of the rubber construction is that the springs absorb most of the road shock, creating a smoother, more stable ride overall when loaded. Wear and tear on the factory suspension is also lessened because the rubber springs work to prevent bottoming out on rough roads.


Timbren Suspension Enhancement Compared to the Competition

Timbren's Suspension Enhancement Systems are much easier to install than air springs - there are no air hoses to run, no compressors or gauges to hook up, and no manual adjustments to make. The rubber construction makes Timbren's springs more elastic than similar products constructed of microcellular urethane. And more elasticity allows for a more comfortable ride when loaded or towing because the rubber has more travel.



FRTT350J Timbren SES with Aeon Hollow Rubber Springs - Rear Axle - Severe Service

Installation Details TFRTT350J Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:

Ratings & Reviews

4.5

877 reviews
8,000-lb Capacity hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. Provides a comfortable ride by absorbing road shock and improving stability. Ideal for trucks with slide-in campers or an in-bed salt spreader.

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See what our Experts say about this Timbren Vehicle Suspension

  • Will Timbren Severe Duty Kit Fit 2022 Ford F-350 with Camper Package
    Hey Tony, based on how the Timbren kit part # TFRTT350J installs I do not see how your overload spring spacer block would interfere with it so this would work for you. Is that block that you have designed to engage the overload springs a little sooner by chance? It almost sounds something like the Torklift Stable Load part # TL89CR which is designed to do that. I attached a picture that shows how the Timbren installs relative to the spring pack.
    view full answer...
  • Does Timbren Severe Duty Kit Fit 2024 Ford F-350 Tremor
    Hey Jeff, I checked with Timbren and the kit part # TFRTT350J that you referenced is a confirmed fit for your 2024 Ford F-350 Tremor. Are you doing some pretty heavy towing?
    view full answer...
  • How Can I Decrease The Gap Between Timbrens And Axle?
    Hello Charles, thanks for reaching out. Yes a 2-1/8" gap is too much. Sounds like you are going to need additional 1" spacers. For that you can use the following: - Timbren 1" Spacer For Raised Frame Vehicles - 3/8" Bushing # A25723-90AH00 Please note that using additional spacers may mean the included bolts are not long enough. In this case you will need to source longer bolts at a local hardware store.
    view full answer...
  • Are Timbren Spacers Required for a Leveling Kit on a 2017 Ford F-350
    Generally speaking, most leveling kits lift the front of the truck 1-2" to match the rear as the factory ride height on most pickup trucks nowadays is about 2" lower in the front than in the rear. This is usually to compensate for squatting while towing with a trailer. As long as the rear of the truck is not lifted then you will not need to use a spacer when installing the Timbren Suspension Enhancement System part # TFRTT350J on your 2017 Ford F-350. However, if the the leveling kit...
    view full answer...
  • Timbren Suspension Enhancement For 2024 Ford F350 Dually 4x4 With Truck Bed Camper
    Hello Jeff, thanks for reaching out. For your 2024 F350 Dually 4x4 I recommend the Timbren Suspension Enhancement System # TFRTT350J. This is a severe service kit which is intended for vehicles just like yours that have a constant load in the bed like a truck camper or salt spreader. Especially considering the added tongue weight from your trailer, you will definitely want the additional support from the severe service kit.
    view full answer...
  • Suspension Enhancement Recommendation for 2022 Ford F-350 with Camper
    Hey Tony, if you are wanting additional suspension support and are concerned about ride quality at all the best solution is the Roadactive Suspension Kit part # RAS3611-SLHD as this is only option that will give the additional support you are looking for and actually improves ride quality. This can provide up to 3,000 lbs of additional suspension support to what your vehicle has currently. If maximum support is desired and ride quality is not a concern then Timbren Severe Service kit...
    view full answer...
  • Height of Timbren SES TFR250SDJ
    Hi Dana; the Timbren # TFR250SDJ are 6-7/8" tall including the mounting bracket. I see you went ahead and ordered the # TFRTT350J instead. Just a heads up, this is the severe service kit so it is designed for a constant heavy load like a slide-in camper or salt spreader. If your truck won't be hauling something like that most of the time I recommend switching to the # TFR250SDJ so you don't end up with a super rough ride.
    view full answer...
  • How Much Space Is Needed To Install The Timbren TFRTT350J On A 2022 Ford F-250 With An In-Bed Camper
    The Timbren TFRTT350J will measure 7" from the top of the bracket to the bottom of the rubber spring/jounce. With you having 8-1/2" of space on your 2022 Ford F-250 Super Duty, you will have a 1-1/2" gap between the bottom of the spring/jounce. It is recommended to have anywhere from 1/2" at the minimum up to 1-1/2" at the maximum for this spacing, so it will definitely work for you. Especially once the camper is installed in the bed. With this also having an 8,000 pound load leveling capacity,...
    view full answer...
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  • What is the Difference Between the Timbren Kits for a 2024 Ford F-250 Super Duty
    Great question, Bret! The Timbren Kit # TFR250SDJ is for a standard pickup while the Timbren Kit # TFRTT350J is for Severe Service vehicles so you would want the 250 in this case. Since you said you want to retain a factory ride quality when unloaded I actually recommend going with the SumoSprings Solo Custom Helper Springs # SSR-127-54 instead. These have a lower capacity at 2,800 lbs, but this is still enough to handle the tongue weight of your 9,500 lb trailer, and you won't feel anything...
    view full answer...
  • Which Suspension Upgrade is the Best Option for a 2025 Ford F-350?
    Hey Bob, congrats on a setting up a new camper! Out of all of those options you'll also need to consider daily driving comfort unless that camper is a permanent addition to your truck bed. Listed below are a brief breakdown of each and a recommendation. The TorkLift StableLoad item # TL89CR that fits your F-350 is going to pre-load your overload springs which will help keep you level and reduce sway/body roll. The overload leaf is a separate, often shorter or differently shaped, spring...
    view full answer...
  • Suspension Enhancement for 2017 Ford F-450 Tow Truck
    Hi Josh; since your 2017 Ford F-450 is a tow truck I recommend getting the Timbren SES over SumoSprings. These provide a higher level of support which will be ideal for your line of work. The # TFRTT350J you were looking at is designed for a constant load in the bed of the truck, like a salt spreader or slide-in camper. I would say your towing equipment also qualifies since it is always sitting on the back of the truck, making this system ideal for your setup so it is what I recommend.
    view full answer...
  • Will Standard Timbren SES With Higher Capacity Offer More Support Than Severe Service On 2021 F-450
    Hey Dustin, welcome back! The Timbren SES # TFRSDJ will offer you more support over the severe service kit # TFRTT350J. Are you experiencing squat with your current Timbrens? If you are then it would be worth upgrading. If you really aren't, then it isn't worth the money. The severe service kit has a different design and engages sooner to help with constant, top-heavy loads like a slide-in camper. With that heavy car hauler you will gain more from the higher capacity of the standard Timbren...
    view full answer...
  • Furrion AC Unit and JT's Strong Arm Stabilizer Kit for a Keystone 2700BH Cougar Sport
    Hey Matthew, thanks for reaching out! The Furrion Chill HE # FR76PR is the same as the part FACR13HESA-BL that you referenced - we just have our own part number for it. When it comes to choosing the correct JT's Strong Arm kit the breaking point is 58" for the distance between the landing gear. The Kit # LC191023 is for 58" or more between the landing gear, while the Kit # LC191024 is for less than 58" between the landing gear. The Timbren Kit # TFRTT350J will fit your truck, but is...
    view full answer...
  • Will Timbren Kit on a 2020 Ford F-250 Level Out a Weight Distribution System
    Thanks for reaching out, Jason! A Timbren kit will help to keep your 2020 Ford F-250 level, yes. There are a few problems with this though; the only rear Timbren kit to fit your truck is the Kit # TFRTT350J which is for Severe Service vehicles so it will be far too stiff for your application. Instead, it would be better to use the SumoSprings # SSR-129-47-2 which won't be as stiff. With all of that being said, I think the main problem you might be facing is a weight distribution system...
    view full answer...
  • Best Timbren Suspension Enhancement For 2023 Ford F-350 Super Duty
    There are two Timbren systems for your 2023 Ford F-350, like you said, with the best definitely being the following part number: - Timbren Suspension Enhancement System # TFR350SDJ The reason for that is the # TFR350SDJ is designed for standard pickups while the other kit, part # TFRTT350J, is designed for service vehicles like a salt spreader, for example. The differences is that the # TFR350SDJ is double convoluted, which just means its shape is designed to compress more, giving you...
    view full answer...
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  • 2024 Ford F-450 Super Duty Timbren Suspension Enhancement Kit Recommendation
    I recommend going with the Timbren Suspension Enhancement System # TFRSDJ for your 2024 Ford F-450 Super Duty because it's designed better for pickup truck-type applications. The other Timbren kit # TFRTT350J is designed more for Severe Service vehicles like that will have more constant heavy loads in them (like a slide-in camper, salt spreader, or crane) so if your F-450 is only going to be used like a pickup then the first kit is what you want to use. We've actually had the opportunity...
    view full answer...
  • Can I Use the Timbren Spacer Kit w/ a Severe Service Timbren System on a 2023 Ford F-250?
    Yes, it does. The Spacer Kit for Timbren Suspension item # T68MR will work with the Severe Service Timbren Suspension Enhancement System item # TFRTT350J. This system is confirmed to fit the 2023 Ford F-250. It already includes a pair of 1" spacers. When installed these spacers make the item # TFRTT350J system 7" tall. I have attached a diagram below. If you don't want need to buy the full kit, you can buy the 1/2" spacer item # TA25722-90P00 or the 1" spacer item # A25723-90AH00 separately....
    view full answer...
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  • Suspension Enhancement Recommendation for 2023 Ford F-350 Towing Fifth Wheel
    When people are looking for suspension enhancement for their trucks like your 2023 Ford F-350 I generally don't like to recommend Timbrens unless the vehicle is going to be basically towing heavy all of the time as they are known to make the ride quality pretty harsh. Instead I would recommend actually the Supersprings kit part # SSA46 which will give you the support you are wanting without making the ride quality rough and actually improves handling and sway. The Torklifts aren't a bad...
    view full answer...
  • How Tall are The Timbren Kits that Fit 2020 Ford F-250
    We have two Timbren rear suspension kits that fit your 2020 Ford F-250 we have the standard duty # TFRTT350J which has a spring height of 3-9/16 inch and a bracket height of 2-3/8 inches. The severe duty # TFR250SDJ is 3-5/8 inches tall and has the same bracket height of 2-3/8 inches plus a 1 inch spacer. Timbren states that once a system is installed you will need 1/2 inch to 1-1/2 inches of space between the bottoms of the springs and the top of the axle. So that's why the higher capacity...
    view full answer...
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  • Timbren Rear Suspension Enhancement System Compatible with 2017 Ford F-350 Super Duty
    First of all, thank you for your service. Unfortunately at this time we don't offer a military discount, but we do have free shipping most of the time on orders like this one. To confirm your fit, we have two sets of jounce springs available from Timbren that are confirmed to fit your 2017 Ford F-350 Super Duty. The Timbren Suspension Enhancement System - Rear Axle # TFRTT350J with a weight rating of 8,000 lbs and the # TFR350SDJ rated for 8,600 lbs. These springs will have a slightly...
    view full answer...
  • What Replacement Bump Stops Are Confirmed to Fit a 2024 Ford F-350 Super Duty?
    Here is a list of the bump stop replacements we have which fit your 2024 Ford F-350. If you can tell me how you plan to use your F-350 I can give you my personal recommendation for the option which works best for you. Timbren Front 2WD # TFF350SD2 4WD # TFF350SDC Timbren Rear 2WD/4WD # TFRTT350J SumoSprings Front 2WD/4WD 1,000LB # SSF-111-40 2WD/4WD 1,500LB # SSF-111-47 SumoSprings Rear 2WD/4WD 3,000LB # SSR-128-40-2 2WD/4WD 1,500LB # SSR-127-47 2WD/4WD 2,800LB # SSR-127-54 2WD/4WD...
    view full answer...
  • Comparing SumoSprings Vs Timbren For A 2022 Ford F-250 Towing A 10,000lbs 5th Wheel
    The Timbren Suspension Enhancement # TFRTT350J has a maximum capacity of 8,000lbs and installs directly to your frame with no drilling required. Whereas, the SumoSprings Rebel # SSR-128-40-2 have a maximum capacity of 3,000lbs at 50 percent compression. In your application I recommend the Timbren Suspension Enhancement # TFRTT350J for its higher payload capacity since you mentioned you were going to be towing a heavier 5th wheel at 10,000lbs. However, it is possible that you may have a...
    view full answer...
  • Compatibility Of Timbren Suspension Enhancement With a Weight Distribution Hitch
    Yes, you will be able to use Timbren suspension enhancement on your 2019 Ford F-250 with a weight distribution hitch. I see you are looking at the System # TFRTT350J which is their severe duty kit. This is best used on vehicles which will always have additional weight like ones with a service bed, salt spreader or always towing. If you are not always towing or have a large load in your truck the Kit # TFR250SDJ will be a better option, This will give you a better ride quality then the severe...
    view full answer...
  • Comparing Timbren FR350SDJ and FRTT350J for 2020 Ford F-350
    The correct Timbren Suspension Enhancement System for a 2020 Ford F-350 is part # TFR350SDJ. The part # TFRTT350J is designed for service body applications. The difference between them is height. The service body version is single convoluted and won't compress as much as the regular version which is double convoluted and will compress more. The more compression you get, the better the ride quality.
    view full answer...


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